Surface spraying method for soluble slip, and soluble slip

Abstract

The invention discloses a surface spraying method for a soluble slip, and the soluble slip. The surface spraying method for the soluble slip comprises the following steps: a plurality of annular grooves are machined in the surface of a slip made of soluble magnesium alloy; oil stains and stains on the surface of the slip are cleaned; nickel-based tungsten carbide particles are subjected to supersonic spraying onto the surface of the slip provided with the annular grooves, the temperature of the nickel-based tungsten carbide particles reaching the slip is controlled not to exceed 200 DEG C, the nickel-based tungsten carbide particles are tightly combined with the slip, and a transition layer is formed for bottoming; the nickel-based tungsten carbide particles are heated, the temperature reaches the melting point of nickel powder but is lower than the melting point of tungsten carbide particles, and a mixture of the molten nickel powder and the non-molten tungsten carbide particles is sprayed onto the bottoming surface of the transition layer; and the sprayed particles are cured by adopting a sealing agent. According to the invention, the transition layer of the nickel-based tungsten carbide particles is firstly subjected to supersonic spraying for bottoming, and then the mixture containing the molten nickel powder and the non-molten tungsten carbide particles is sprayed, so that the combination strength and stability of the nickel-based tungsten carbide particles and the surface of the slip can be improved, and the bearing capacity of the slip is improved.

Description

technical field [0001] The invention relates to the technical field of oilfield equipment, in particular to a surface spraying method of soluble slips and the soluble slips thereof. Background technique [0002] In the technical field of petroleum engineering well completion and fracturing operations, it is often necessary to perform staged fracturing operations on different intervals of vertical wells, directional wells, or horizontal well bores. During the staged fracturing process, it is necessary to use bridge plugs to achieve Isolation, bridge plugs include slips that play an anchoring and supporting role. [0003] Before the slips were made of cast iron or other metal materials, after the operation was completed, it was necessary to use milling tools to mill chips on the bridge plug. The efficiency of milling chips was relatively slow, and it was necessary to salvage the remaining large pieces of metal. This work was delayed. A lot of operating time increases the cost...

AI Technical Summary

Problems solved by technology

[0006] However, the traditional spraying method has many limitations, and the traditional spraying method cannot achieve the optimal effect:

[0007] Supersonic spraying: it can only be a physical combination, and the particles are very fine, which does not have much effect on improving the surface friction; spray welding and remelting: the parts are not resistant to high temperature, this process needs to be heated to a temperature of about 1150 ℃, magnesium The alloy cannot withstand such a high temperature; laser surfacing: the combination of the surfacing layer and the substrate is not good, and the surface coating is easy to fall off during use; using glue and other curing agents: although this method can solve the problem of the combination of the coating and the substrate Strength, the bonding between the coating particles, however, the bonding strength between the particles is not enough, the particles are easy to fall off

[0008] The Chinese patent application publication number CN 112377122 A discloses a fully soluble slip. The preparation method of the fully soluble slip is to coat a water-soluble magnesium-aluminum alloy body with a layer of strong wear resistance and high friction coefficient. Nickel-based alloy thin layer, during production, the molten or softened nickel-based alloy powder is sprayed onto the surface of the water-soluble magnesium-aluminum alloy body. However, the connection structure between the nickel-based alloy and the magnesium-aluminum alloy body is stable Crossover, the bearing pressure that can be achieved is prioritized, and it cannot meet the larger bearing capacity

[0009] The Chinese patent application publication number CN 108643849 A discloses a soluble slip and a soluble bridge plug. In this solution, an adhesive layer is provided on the outer wall of the slip body, and the surface of the adhesive layer is uneven. There is a surface coating on the surface, and the surface coating is prepared by cemented carbide particles. Although the uneven surface is used to improve the bonding strength with the cemented carbide particles, the connection stability is still limited, and it cannot achieve a relatively high level. large carrying capacity

[0010] The Chinese patent application publication number CN 111763906 A discloses a system and method for supersonic plasma spraying nickel-based alloy coating, however, after the experiment of supersonic plasma spraying nickel-based tungsten carbide on the surface of soluble slips Afterwards, its experimental results proved that it could not meet the qualified standard

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